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from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A rare silicate mineral of the mica group.

from The Century Dictionary and Cyclopedia

  • n. In mineralogy, a kind of mica, allied to biotite, but characterized by the presence of a large amount of iron protoxid and the almost complete absence of magnesia: it is found near Pike's Peak in Colorado.


sidero- +‎ phyllite (Wiktionary)


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